the power supply to your enlarger needs to be voltage stabilized for color printing. you might want to check if the power supply for your enlarger incorporates voltage stabilization or if you need to buy one separately.
I've used the room temperature Tetenal mono 2.5 liter kits with very good results. If you buy a Nova slot processor, however, you can use the regular RA-4 5 liter kit at 86 or 95 F. This will end up costing you half as much per chemical volume.
a rotary processor would be better for prints larger than 8x10 and up to 16x20.